Provided by: grass-doc_7.8.7-1_all 

Topic: mask
r.mask Creates a MASK for limiting raster operation.
r3.mask Establishes the current working 3D raster mask.
See also the corresponding keyword mask for additional references.
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© 2003-2022 GRASS Development Team, GRASS GIS 7.8.7 Reference Manual
GRASS 7.8.7 topic_mask(1grass)